Rewrite per Max feedback: the ADR no longer triggers a switch to Alpha
Vantage Premium 49.99 USD/mo. It only overrides the Tiingo Power
pre-designation in ADR 0011 with Alpha Vantage Premium as the new
bascule target, validated empirically via free tier.
Yahoo best-effort stays in prod. Bascule deferred to a real trigger
(first paying licensee, or first formal complaint, or saturated
incidents). The ToS email to support@alphavantage.co is deferred to the
same trigger — no upfront paranoid effort.
Status flips from Proposed to Accepted (no suspensive condition).
Refs maximus-api#41
Override partial of ADR 0011: Tiingo Power pre-designation is invalidated
by 2026 pricing reality (~30 USD/mo, not 10) AND by ToS (Power tier is
internal-use only; multi-tenant proxy requires Commercial 500+/mo plus a
redistribution license).
Alpha Vantage Premium 49.99 USD/mo retained as direct Yahoo replacement,
under suspensive condition of written ToS authorization for commercial
multi-tenant proxy use.
Phase 2 smoke test surfaced a key finding: Alpha Vantage silently accepts
Yahoo-style .TO ticker suffix as alias of .TRT, removing the need for any
mapping table. Drop-in compatible with existing Yahoo provider code.
Refs maximus-api#41
